400 it sucks!!!!!!!!!!!!
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Laughing Gas
Joined: Dec 2004
Posts: 754
Likes: 3
From: Idaho
400 it sucks!!!!!!!!!!!!
Ok guys help me out here I've seen 400's run good I've driven 400's that run good but mine SUCKS!!!!!!!!!!!! Now then the last 4 trucks I've had ran 429's or 460's anywhere from stock to radical the best one being a 429 dove block stroked to 460 with dove heads harlond sharp rockers stock pistons dooe intake.edelbrock 600 carb and a comp 4x4 extreame cam ran great!!!! now I have a 1978 f250 with a edelbrock intake and carb 600 cfm 60's front and rear and its like driving an anchor!!!!!!!!!!! the motor is a stock rebuild with 7000 on it but it is realy depressing to drive, awful fuel mileage and no power the timing is good as is everything else, it runs good as far as no miss or anything like that just no power and crappy fuel economy. HELP!!!!!!!!!!!!
New User
Joined: Feb 2008
Posts: 10
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i used to have a problem similar to that with my 351m with an edelbrock performer 400 intake and holley 600 carb... but i never really watched the gas mileage issue... what was wrong with mine was the secondaries werent opening on the carb and it would just drag when i would floor it and it was all around gutless... brought the carb to a guy in town and had it rebuilt and then it felt like it had power
More Turbo
Joined: Aug 2007
Posts: 555
Likes: 2
From: Washington state
Originally Posted by 78smurf
i used to have a problem similar to that with my 351m with an edelbrock performer 400 intake and holley 600 carb... but i never really watched the gas mileage issue... what was wrong with mine was the secondaries werent opening on the carb and it would just drag when i would floor it and it was all around gutless... brought the carb to a guy in town and had it rebuilt and then it felt like it had power
Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
Originally Posted by 85e150six4mtod
Stock rebuild with the stock heads, stock valve timing, stock cam, stock compression? That's all the stuff that's wrong with a 400 and if it's all stock, it will be a pig till that's fixed.
??? Doesn't sound like a stock 400 to me... My last stock 400 was a terror on the street, and I never changed a thing on it, even the 2V carb! Yeah, it lost a lot of power after 4000 rpm, but until then, tire smoke and giggles! You just need some diagnosis and fine tuning and all will be well again. Start with the little things.
Posting Guru
Joined: Dec 2002
Posts: 2,003
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From: chicago burbs
Originally Posted by alans77crew
awful fuel mileage and no power the timing is good as is everything else...
what does the timing advance to when you slowly increase the rpm? this is with the vacuum disconnected and plugged.
then, with the vacuum connected, rpm held at a high idle, does the timing change when you disconnct/reconnect the vacuum hose?
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Laughing Gas
Joined: Dec 2004
Posts: 754
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From: Idaho
Ya know I never even thought about the dist! that could be it ! the 600 edelbrock are all mechanical secondaries and they are working. the funny thing is I just put the same setup in a buddys truck and it runs like a stripped *** ape! the only thing different is his is a c6
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Posting Guru
Joined: Jul 2007
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Ok guys help me out here I've seen 400's run good I've driven 400's that run good but mine SUCKS!!!!!!!!!!!! Now then the last 4 trucks I've had ran 429's or 460's anywhere from stock to radical the best one being a 429 dove block stroked to 460 with dove heads harlond sharp rockers stock pistons dooe intake.edelbrock 600 carb and a comp 4x4 extreame cam ran great!!!! now I have a 1978 f250 with a edelbrock intake and carb 600 cfm 60's front and rear and its like driving an anchor!!!!!!!!!!! the motor is a stock rebuild with 7000 on it but it is realy depressing to drive, awful fuel mileage and no power the timing is good as is everything else, it runs good as far as no miss or anything like that just no power and crappy fuel economy. HELP!!!!!!!!!!!!
You sure it aint an ol´ worn out 351m, they are virtually identical the diference is internal(crank and pistons), and stockish 351m are lame dogssss
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Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
Dang, the 351M in my '78 wasn't lame at all... I could pull anything with that truck ( much more than what it was rated for, anyway! lol) and it was quick off the line. Can still squawk the tires with over half a million on her... Getting ping when accelerating though, from stretched chain...
I would love to rebuild that one into a 400; It is a very well seasoned block!
I would love to rebuild that one into a 400; It is a very well seasoned block!
Senior User
Joined: Aug 2007
Posts: 349
Likes: 1
From: Ohio
im agreein with Goose, possibly see how much ur exhaust is restricted. i know of some bad 400's (hard to believe), i have a tempermental one, on a good day, it could pull the world if u could hook on to it, on other days, everyonce in a while, it will wanna give u a hard time.
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Laughing Gas
Joined: Dec 2004
Posts: 754
Likes: 3
From: Idaho
well thanks guy's for all the help I think I found the problem,first of all I took a real close look at the dist and low and behold the jackass that stabbed the dist did it a 180 out then just walked the wire's around to fix it! so I says to myself self if this idiot cant put a dist in right what else did he screw up??? so I pull the cap off and the vacume advance is not hooked up the pickup coil and the pickup is retarded as far as can be and STUCK there. so I lubed it all up and reconnected every thing and retimed it and it runs much more gooder now!!!!! thanks gents for all your help
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